Biological process

down regulation of protein exit from endoplasmic reticulum, down-regulation of protein exit from endoplasmic reticulum, downregulation of protein exit from endoplasmic reticulum, negative regulation of protein exit from ER, negative regulation of protein export from ER, negative regulation of protein export from endoplasmic reticulum

Any process that stops, prevents, or reduces the frequency, rate or extent of the directed movement of proteins from the endoplasmic reticulum.